<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>圆角边框</title>
		<style>
			div#d1{
				magin:100px;
				border: 25px outset green;
				height: 300px;
				width: 300px;
				border-radius: 20px 100px;
			}
			div#d2{
				height: 300px;
				width: 300px;
				border: 10px solid red;
				border-radius: 50%;
				background-image: radial-gradient(red,blue,green,gold);
			}
			div#d3{
				height: 300px;
				width: 600px;
				background-color: blue;
				margin: 50px;
				border-radius:50%;
				
				background-image: radial-gradient(red,blue,green,gold);
				/* border-radius: 300px 600px 600px 300px; */
			}
			div#a4{
				height: 400px;
				width: 400px;
				background-color: aqua;
				border-radius: 100% 0 0 0;
			}
		</style>
	</head>
	<body>
		<div id="d1"></div>
		<div id="d2"></div>
		<div id="d3"></div>
		<div id="a4"></div>
	</body>
</html>